Hi, This is a great little project. I have made something similar using only a DHT22 and an ESP-01 which works fairly well also going to thingspeak, but I was on the lookout for a pressure sensor to add to the mix as well. I have got myself a BMP280 but have not yet got to playing with it.When I found your solution it intrigued me. The only issue I had was that the modules needed to be modified to use the SDA/SCL and I was hoping to make something that I could make fairly quickly and be able to switch the ESP modules really easily.Then I did some research and found this article. Now I'm using the Arduino programming for my sensor and thought it may come in handy for you also.I've got some more ESP's on the way now so will have more of a play and I'm hoping to put some instructable's up ...

Hi, This is a great little project. I have made something similar using only a DHT22 and an ESP-01 which works fairly well also going to thingspeak, but I was on the lookout for a pressure sensor to add to the mix as well. I have got myself a BMP280 but have not yet got to playing with it.When I found your solution it intrigued me. The only issue I had was that the modules needed to be modified to use the SDA/SCL and I was hoping to make something that I could make fairly quickly and be able to switch the ESP modules really easily.Then I did some research and found this article. Now I'm using the Arduino programming for my sensor and thought it may come in handy for you also.I've got some more ESP's on the way now so will have more of a play and I'm hoping to put some instructable's up about them at some point too.Thanks for inspiring me!

Hi msuzuki77,My first attempt at a battery powered weather station used an 18650, an arduino mini 3.3v and an ESP8266. I had it running off a single 18650 battery to begin with and had the electronics to charge it as follows:12v Solar Panel (Cheap at the time) > 5v Step down convertor > 18650 charger and protection circuit > 18650 battery18650 battery > battery protection circuit > Boast converter 5v > 3.3v regulator > Arduino/ESP8266/DHT22 etcIt would work but as you can imagine it was a bit of a pain and very inefficient.The biggest annoyance was when the battery ran low enough to trigger the protection. It would then recharge from the solar panel or external source but the protection circuit did not re-enable power to the load. I found I have to short the negativ...

Hi msuzuki77,My first attempt at a battery powered weather station used an 18650, an arduino mini 3.3v and an ESP8266. I had it running off a single 18650 battery to begin with and had the electronics to charge it as follows:12v Solar Panel (Cheap at the time) > 5v Step down convertor > 18650 charger and protection circuit > 18650 battery18650 battery > battery protection circuit > Boast converter 5v > 3.3v regulator > Arduino/ESP8266/DHT22 etcIt would work but as you can imagine it was a bit of a pain and very inefficient.The biggest annoyance was when the battery ran low enough to trigger the protection. It would then recharge from the solar panel or external source but the protection circuit did not re-enable power to the load. I found I have to short the negative contacts between load and battery to re-enable to power.Obviously the inefficiency was a higher concern but the fact the protection wasn't re-enabling the power was very annoying!What I have now is just the ESP8266 and the DHT running alone and have modified my Arduino code to run on the ESP8266. It works very well and so far has run from a single battery for more than a couple of days, way better than the ~12 hours I got with the Arduino combination.My next issue is the protection circuit and charging though. Can I charge the battery and have a load on it through the same protection circuit? How can I get the protection circuit to re-enable to load when the battery reaches a safe charge level?